Colour Standards

Reflectance Standards & Kits

The CIE

International Commission on Illumination

and ASTM

American Society for Testing and Materials

both specify either packed barium sulphate or packed polytetrafluoroethylene (PTFE) powder as standards for the measurement of diffuse reflectance. Warsash Scientific offer kits for the accurate and reproducible fabrication of such standards. Kits are available to produce both 25mm and 52mm diameter standards. Barium sulphate kit is available in 25mm size only.

The kits consist of a three part press, two calibrated cups for the production of the standards, and 500g of either highly purified barium sulphate or PTFE

polytetrafluoroethylene

powders which have been finely ground to remove lumps which may cause a reduction in reflectance from the literature reflectance values. Additional refills of the standard powders are also available. Instructions for use of the presses are included.
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